package com.htwz.gateway.config;

import cn.hutool.json.JSONUtil;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * Swagger资源配置 Created by macro on 2020/7/9.
 */
@Component
@Primary
@AllArgsConstructor
@Slf4j
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

	public static final String API_URI = "/v2/api-docs";

	private final RouteLocator routeLocator;

	private final GatewayProperties gatewayProperties;

	@Override
	public List<SwaggerResource> get() {
		List<SwaggerResource> resources = new ArrayList<>();
		List<String> routes = new ArrayList<>();
		// 获取所有路由的ID
		routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
		// 过滤出配置文件中定义的路由->过滤出Path Route Predicate->根据路径拼接成api-docs路径->生成SwaggerResource
		log.info("List<SwaggerResource> " + JSONUtil.toJsonStr(gatewayProperties.getRoutes()));
		gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
				.forEach(route -> {
					route.getPredicates().stream()
							.filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
							.forEach(predicateDefinition -> resources
									.add(swaggerResource(route.getId(), predicateDefinition.getArgs()
											.get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI))));
				});

		return resources;
	}

	private SwaggerResource swaggerResource(String name, String location) {
		log.info("name:{},location:{}", name, location);
		SwaggerResource swaggerResource = new SwaggerResource();
		swaggerResource.setName(name);
		swaggerResource.setLocation(location);
		swaggerResource.setSwaggerVersion("2.0");
		return swaggerResource;
	}

}
